Carburetor



March 14, 3967 L. w so 3,309,070

CARBURETOR Filed Sept. 23, 1964 INVENTOR. C (1/7 25 L. AJZ Z Z United States Patent Ofitice snaps Patented Mar. 14, 1S6? The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

The present invention relates to a carburetor for an internal combustion engine which is simple and inexpensive to construct and which is simple and highly effective in operation.

The accompanying drawing is a cross section through the carburetor of the present invention.

An air intake is illustrated at with a constriction ring at 12 (which may be omitted if desired). An adjustable valve element M cooperates with movable valve element 16 to meter fuel drawn up through immersion tube 18.

Dispersal disc Zii, secured to immersion tube 18, supports a basket of Fiberglass 22. Fuel from line 24 is admitted at 25 through a valve 26 controlled by float 28. Cap 39 closes the lower end of the carburetor 11 and carries an adjustable screw 32 to vary pressure on spring 34- and immersion tube 18. Dashpot plunger 36 is mounted on the lower end of immersion tube 18.

Throttle butterfly valve 38 is mounted in throat 40 as illustrated. Flange 42, with holes 44, adapts the carburetor for mounting to an engine block or intake manifold.

Operation Air is drawn into the carburetor 11 at It The air pressure is lowered at the restricted area near 12, 14, 16 to thus draw fuel up through immersion tube 18 and out past 14 at 16. The fuel and air are mixed as they commingle and pass down through fiber 22 where turbulence and flow restricting fibers complete the mixing process.

As the level of fuel is lowered float 28 opens valve 26 to replenish the supply. When throttle 38 is opened air rushes through the air intake passage and through fiber basket 22. This increase in air flow exerts a downward force on fiber 22, disc 20 and immersion tube 18 thereby opening valve 16, 14 further to admit a correspondingly increased quantity of fuel. When throttle 38 is closed the rate of air flow is decreased and valve 16, 14 is correspondingly partially closed. Dashpot plunger 36 reduces the rate of opening or closing of valve 16, 14 during speedup or slowdown. It also damps out vibrations of the immersion tube 18 and valve member 16 as pulsations occur in the engine intake manifold. Thus, flutter of valve member 16 and pulsations of engine power are minimized.

The simple, inexpensive apparatus described performs functions not obtainable in many complicated expensive carburetors.

I claim:

1. A carburetor comprising: an air intake passage;

means forming a dashpot including a combination float bowl and dashpot chamber; means to admit a vaporizable fuel to said float bowl and dashpot chamber; a fuel-air mixture passage leading from said carburetor and connectable to an intake passage of an internal combustion engine; means to admit fuel from said float bowl and dashpot chamber to said intake passage; atomizer means responsive to increased fluid flow in said fuel-air mixture passage; said atomizer means comprising a fibrous atomizer mounted in said air intake passage past the location where fuel is admitted to said passage; and an immersion tube connected to the dashpot and supporting said atomizer in a basket in the air intake passage; a valve operatively connected to said immersion tube and communicating with said air intake passage to vary the quantity of fuel in proportion to the rate of air flow in the air intake passage and to minimize fuel pulsations admitted through said valve.

2. Apparatus as in claim 1; and resilient means urging said dashpot and immersion tube toward a position to close the valve, and means to adjust the tension on said resilient means.

3. Apparatus as in claim 2; and means to adjust said valve toward open or closed position, and a dispersal disk supporting said atomizer.

4. Apparatus as in claim 3; and a throttle member in said fuel-air mixture passage to vary the rate of flow of fluid therethrough, thereby also varying the rate of flow of fluid through said fibrous atomizer and past said dispersal disk, the variable flow of fluid reacting through said atomizer, disk and immersion tube to increase said valve member opening upon increased fluid flow and to decrease said valve member opening upon decreased fluid flow.

5. A carburetor comprising: means to admit fuel into a float bowl; means forming a dashpot in said float bowl; an air intake passage; an air-fuel discharge passage; valve means in said air intake passage; an immersion tube connected to said dashpot and said valve means through which fuel may flow from said float bowl to said valve means; and further means including a fibrous fuel-atomizing material in said air intake passage connected to said valve means and to said dashpot and responsive to an increase of flow of air and fuel in said air intake passage to in crease the valve opening, said dashpot serving to minimize valve flutter from pulsations of air flow.

6. Apparatus as in claim 5; and a throttle element in said air-fuel discharge passage to vary the flow of fluid therethrough.

7. Apparatus as in claim 5; and adjustable-tension means urging said dashpot and immersion tube in a direction opposing pressure exerted on said tube by flow of air and fuel in said air intake passage.

References Cited by the Examiner UNITED STATES PATENTS 1,009,252 11/1911 Mallo 261-69 1,283,154 10/1918 Godward 261-62X 1,787,854 1/1931 Braun 261-62X 1,848,036 3/1932 Weber 261-50 2,323,721 7/1943 McLindon 261-62 FOREIGN- PATENTS 528,939 11/1940 Great Britain.

HARRY B. THORNTON, Primary Examiner.

T. R. MILES, Assistant Examiner. 

1. A CARBURETOR COMPRISING: AN AIR INTAKE PASSAGE; MEANS FORMING A DASHPOT INCLUDING A COMBINATION FLOAT BOWL AND DASHPOT CHAMBER; MEANS TO ADMIT A VAPORIZABLE FUEL TO SAID FLOAT BOWL AND DASHPOT CHAMBER; A FUEL-AIR MIXTURE PASSAGE LEADING FROM SAID CARBURETOR AND CONNECTABLE TO AN INTAKE PASSAGE OF AN INTERNAL COMBUSTION ENGINE; MEANS TO ADMIT FUEL FROM SAID FLOAT BOWL AND DASHPOT CHAMBER TO SAID INTAKE PASSAGE; ATOMIZER MEANS RESPONSIVE TO INCREASED FLUID FLOW IN SAIDFUEL-AIR MIXTURE PASSAGE; SAID ATOMIZER MEANS COMPRISING A FIBROUS ATOMIZER MOUNTED IN SAID AIR INTAKE PASSAGE PAST THE LOCATION WHERE FUEL IS ADMITTED TO SAID PASSAGE; AND AN IMMERSION TUBE CONNECTED TO THE DASHPOT AND SUPPORTING SAID ATOMIZER IN A BASKET IN THE AIR INTAKE PASSAGE; A VALVE OPERATIVELY CONNECTED TO SAID IMMERSION TUBE AND COMMUNICATING WITH SAID AIR INTAKE PASSAGE TO VARY THE QUANTITY 